机械压力表采用弹簧管(波登管)、膜片、膜盒及波纹管等敏感元件并按此分类。敏感元件一般是由铜合金、不锈钢或由特殊材料制成。

     弹簧管(波登管)分为C型管、盘簧管、螺旋管等型式。一般采用冷作硬化型材料坯管，在退火态具有很高的塑性，经压力加工冷作硬化及定性处理后获得很高的弹性和强度。弹簧管在内腔压力作用下，利用其所具有的弹性特性，可以方便地将压力转变为弹簧管自由端的弹性位移。弹簧管的测量范围一般在0.1MPa ~ 250MPa。

     膜片敏感元件是带有波浪的圆形膜片，膜片本身位于两个法兰之间，或焊接在法兰盘上或其边缘夹在两个法兰盘之间。膜片一侧受到测量介质的压力。这样膜片所产生的微小弯曲变形可用来间接测量介质的压力。耐震压力表压力的大小由指针显示。膜片与波登管相比其传递力较大。由于膜片本身周围边缘固定，所以其防振性较好。膜片压力表可达到很高的过压保护(比如膜片贴附在上法兰盘上)。膜片还可以加上保护镀层以提高防腐性。利用开口法兰、冲洗、开口等措施可用膜片压力表测量粘度很大、不清洁的及结晶的介质。不锈钢压力表的压力测量范围在1600Pa ~ 2.5 MPa。

Mechanical pressure gauge with spring tube (bourdon tube), diaphragm, bellows, bellows and other sensitive element and according to the classification.Sensitive element is usually made of copper alloy, stainless steel, or made of special materials.Spring tube (bourdon tube) is divided into C type tube, www.hfybdl.com coil spring tube, spiral pipe type, etc.Commonly used type cold work hardening material tube billets, in annealing state of high plasticity, after pressure processing of cold work hardening and qualitative treatment for high strength and flexibility.Spring tubes, cavity pressure, using the elastic characteristics of had by it can conveniently to turn pressure into spring tube free the elastic displacement.Spring tube measurement range is in commonly 0.1 MPa to 250 MPa.Diaphragm is sensitive element with a wave of circular diaphragm, diaphragm itself is located between two flanges, or weld on the flange or its edge sandwiched between two flanges.By measuring the pressure of medium diaphragm side.This diaphragm produced by tiny bending deformation can be used to indirectly measuring the pressure of medium.The size of the pressure by pointer display.Diaphragm and bourdon tube compared to its larger heritability.Because the diaphragm itself around the edge of the fixed, so its vibration control is better.Diaphragm pressure gauge can achieve very high overvoltage protection (diaphragm attached on the flange plate, for example).Diaphragm can also be combined with protection coating to improve the anticorrosion.Using measures such as the opening flange, flushing, opening available diaphragm pressure gauge measuring viscosity is very big, clean and crystallization of the medium.Diaphragm pressure gauge measuring range in 1600 pa ~ 2.5 MPa.www.hfybdl.com